class A {
   int m;
   int getM() {
      return m;
   }
   int seeM() {
      return m;
   }
}
class B extends A {
   int m;
   int getM() {
      return m+100;
   }
}
public class E3 {
public static void main(String args[]) {
   B b = new B();
   b.m = 20;
   System.out.println(b.getM());
   A a = b;
   a.m = -100;
   System.out.println(a.getM());

   System.out.println(b.seeM());

  }
}

